Sometimes the most brilliant individual thinkers are bad at bringing people along.
To be fair, it's far, far harder to "bring along" an audience on a multi-ply journey.
It's not necessarily that they're bad at bringing people along in an absolute sense, it could be that that's the limiting factor for them because the quality of their individual thinking is so strong.
Most people are bad at bringing people along… they just don't have anything particularly challenging to bring people along with, so you don't notice!